This unit provides an understanding of the nature and limits of processing of media (image, video, audio) for telecommunications, storage, interpretation and analysis. It includes compression of multimedia from basic information theoretic concepts through to advanced video (e.g. MPEG), image (JPEG, JPEG2000) and audio (CELP, MP3, AAC, Dolby Digital) coding. XML-based metadata systems are used to illustrate concepts of content characterisation and discovery. The ability of modern network protocols to support media streaming is related directly to service requirements such as error and delay tolerance. Where media is intended for human consumption, the characteristics of human perception of image and sound determine minimum quality requirements, but also reveal limitations that can be exploited when compressing media data. Machine interpretation and analysis of multimedia is also investigated. Case studies in media analysis (e.g. Shazam), delivery (video on demand) and consumption (digital cinema) are used to illustrate the technologies investigated.
The minimum total expected workload to achieve the learning outcomes for this unit is 144 hours per semester typically comprising a mixture of 3-6 hours of scheduled learning activities and 6-9 hours of independent study per week. Scheduled activities may include a combination of teacher-directed learning, peer-directed learning and online engagement. Independent study may include associated readings, assessment and preparation for scheduled activities.
Explain the methods of digital rights managements systems, including the role of encryption and key management, and the importance of such systems to enable high-value digital content retrieval services such as movies-on-demand.
Explain how media can be characterised and described, including methods that allow similarities to be automatically identified (e.g. music matching services).
Describe the structure of modern multimedia compression systems, and how they exploit the characteristics of both the media itself and human consumers of the media.
Identify the limits of human visual and aural perception, and how they can be exploited for bit rate reduction.
As part of a team, research and investigate an area of interest beyond lecture material, involving software simulations and analysis of results.
Compute the end-to-end delay performance of modern Internet protocols supporting media streaming, and relate this to service requirements for on-demand and communicative multimedia services.
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